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Note 9 - Concentrations (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Count
   
2018
   
2017
 
1      
254,018
     
179,292
 
2      
117,589
     
100,322
 
3      
93,563
     
88,284
 
4      
72,557
     
56,008
 
5      
44,316
     
45,443
 
6      
-
     
40,655